Update to 2.4.1.

A short changelog compared to 2.3:

* Input and output support for MKV and FLV containers
* Rewritten MP4/MOV/3GP reader
* Support for Nellymoser codec
* New DV video output support
* New MPEG-TS support including H.264 Elementary Stream
* OCR support for MPEG-TS subtitles
* New video bitstream unpacker (improved compatibility)
* Capability to pack video bitstreams
* New Yadif filter (ported from Avisynth)
* Video filters can be loaded as external plug-ins (sample plug-in included)
* Three interfaces now offered: command line, GTK+ and Qt4 (Qt4 is still incomplete)
* Several key dialogs have been revamped (GTK+ user interface only)
* Preview system refactored
* Priority control added for encoding and video playback (Win32 only)
* New Jog Shuttle control (GTK+ user interface only)
* Support for Jog Shuttle hardware (Linux & GTK+ only)
* New iPod and PlayStation Portable profiles
* New Glyph Editor
* Improved Bitrate Histogram
* JACK support (Linux only)
* DirectX support (Win32 only)
* New Avisynth Proxy GUI (Win32 only)
* Improved crash recovery - session settings are saved and reloaded upon
  application start
* Numerous bugs fixed

...and more, see the changelog for more info.

(xtraeme)